MSI X99S GAMING 9 AC - Manual (Page 35)

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SATA_EX1: SATA Express Connector
The SATA Express, a new high performance storage interface, supports to connect 1
SATA Express device with up to 10 Gb/s transfer rate. Connects the SATA Express
device to this 3-in-1 connector by a SATA Express cable.
SATA Express
M2_1: M.2 Port
The M.2 port supports either M.2 SATA 6Gb/s module or M.2 PCIe module.
Video Demonstration
Watch the video to learn how to install M.2 module.
http://youtu.be/JCTFABytrYA
Important
• The SATA Express port/ SATA5~6 ports will be unavailable when installing the M.2
SATA interface module in the M.2 port.
• Intel RST does not support PCIe M.2 SSD with Legacy ROM.
• M.2 PCIe interface does not support RAID 0, RAID1, RAID 5 and RAID 10.
• Always turn off the power supply and unplug the power cord from the power outlet
before installing or removing the M.2 module.